Built-in dual-function protection device for battery and battery

Abstract

The invention provides a built-in dual-function protection device for a battery. The built-in dual-function protection device comprises electrode flexible connection pieces, a turnover piece, a fuse disconnecting part and a fuse, wherein two ends of the fuse are connected with lugs and poles for conducting the battery through the electrode flexible connection pieces; one end of the fuse disconnecting part is arranged at the inner side of the turnover piece and the other end of the fuse disconnecting part is connected with the fuse in an associated manner; and a fracture is arranged at the connected part of the fuse and the fuse disconnecting part. The built-in dual-function protection device for the battery and the battery have dual insurance functions; when short circuit exception of an electric circuit occurs between a positive electrode and a negative electrode of the battery, the fuse is immediately fused due to overload, so that the first protection function of disconnecting the circuit of the battery is achieved; and when the battery abnormally swells and the gas pressure in a sealed battery shell reaches a turnover pressure design value of the turnover piece, the turnover piece is linked with the fuse disconnecting part, the external acting force is generated on the fuse and the fuse is disconnected due to stress, so that the second protection function of disconnecting acharge and discharge circuit of the battery is achieved.

Description

technical field [0001] The invention relates to a short-circuit protection device for batteries, which belongs to the technical field of batteries, in particular to a built-in dual-function protection device for batteries and a battery using the protection device. Background technique [0002] At present, the rechargeable batteries that are mass-produced and used in equipment on the market are generally power-type square batteries or energy-storage square batteries in the new energy industry, or large-scale cylindrical batteries. The active short-circuit design scheme of the battery pole is to design an arc-shaped flip sheet on the conductive connection plate of the battery pole. When the internal pressure of the battery may rise to the point where the explosion-proof sheet acts to release the pressure, or there may be an explosion and fire hazard, let the flip Chip action, conducting the positive and negative poles of the abnormal battery or the cover plate of the entire pa...

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Problems solved by technology

[0003] 1. For the explosion-proof battery cover plate with active short-circuit protection function of the reversing sheet, when the abnormality of the battery causes the reversing sheet to act and short-circuit the positive and negative electrodes, high temperature will be generated on the flexible connection sheet, and high-temperature metal slag may be generated when the fuse is blown. Such high-temperature and high-temperature metal slag will definitely lead to an increase in the temperature in the battery container, which may accelerate the gasification of the highly active electrolyte, resulting in unpredictable risks; in addition, when there are many such batteries to form a large-capacity parallel battery pack for application , one of the batteries is abnormal, and after the active short-circuit action of the flip plate, the soft connection plates inside the container of all the single batteries in the parallel circuit will be fused at high temperature due to the high current; but in fact, the abnormal battery with real problems There is only one, and the other fused batteries connected in parallel are not a problem, because after the soft connection piece inside the battery container is fused, all the batteries will not be able to recover and can only be completely scrapped, which will cause a great waste of resources

[0004] 2. This design of short-circuiting the flippers by increasing the internal pressure is not suitable for high-capacity battery packs that are connected in series first and then in parallel, because when the single batteries are connected in series first, a battery in a string has a problem , After the flipping action short-circuits the battery and continues to connect the bridge, another one or more batteries connected in series will share the voltage of the whole string of batteries and become a high-voltage charge and discharge state. This high-voltage charge and discharge will damage the battery. It is easy to cause these high-voltage batteries to heat rapidly and cause sequential damage; that is to say, the rechargeable batteries that are being used in large quantities in our industry are characterized by being unable to withstand high voltage and can only withstand high current

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